//
// Mono.Xml.SecurityParser.cs class implementation
//
// Author:
//	Sebastien Pouliot (spouliot@motus.com)
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.IO;
using System.Security;

namespace Mono.Xml
{
    // convert an XML document into SecurityElement objects
    internal class SecurityParser : SmallXmlParser, SmallXmlParser.IContentHandler
    {
        private SecurityElement root;

        public SecurityParser()
            : base()
        {
            stack = new Stack();
        }

        public void LoadXml(string xml)
        {
            root = null;
#if CF_1_0
            stack = new Stack();
#else
            stack.Clear();
#endif
            Parse(new StringReader(xml), this);
        }

        public SecurityElement ToXml()
        {
            return root;
        }

        // IContentHandler

        private SecurityElement current;
        private Stack stack;

        public void OnStartParsing(SmallXmlParser parser)
        {
        }

        public void OnProcessingInstruction(string name, string text)
        {
        }

        public void OnIgnorableWhitespace(string s)
        {
        }

        public void OnStartElement(string name, SmallXmlParser.IAttrList attrs)
        {
            SecurityElement newel = new SecurityElement(name);

            if (root == null)
            {
                root = newel;
                current = newel;
            }
            else
            {
                SecurityElement parent = (SecurityElement)stack.Peek();
                parent.AddChild(newel);
            }

            stack.Push(newel);
            current = newel;
            // attributes
            int n = attrs.Length;

            for (int i = 0; i < n; i++)
            {
                string attrName = SecurityElement.Escape(attrs.GetName(i));
                string attrValue = SecurityElement.Escape(attrs.GetValue(i));
                current.AddAttribute(attrName, attrValue);
            }
        }

        public void OnEndElement(string name)
        {
            current = (SecurityElement)stack.Pop();
        }

        public void OnChars(string ch)
        {
            current.Text = ch;
        }

        public void OnEndParsing(SmallXmlParser parser)
        {
        }
    }
}
